Etoeto Wanikani is a free Chrome extension developed by Ajite. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools subcategory. This extension aims to replace kana in etoeto with known Kanji from Wanikani.

To use Etoeto Wanikani, you need to add your WaniKani API key in the Chrome extensions options. Once activated, the extension will convert kana into kanji based on your level in WaniKani. However, it does not convert single kana characters such as "に" into kanji like "二".

It is important to note that Etoeto Wanikani is a proof of concept and does not have any caching functionality. As a result, there may be instances where you receive a different character that uses similar kana.